Method of manufacturing composite metallic articles.



UNITED STATES PATENT OFFICE.

JOHN KIRIBY, 0F PITTSBURGH, PENNSYLVANIA.

METHOD OF MANUFACTURING COMPOSITE METALLIC ARTICLES.

No Drawing.

To all whom it may concern:

Be it known that I, J on) Kinny, acitizen of the United States ofAmerica, residing at Pittsburgh, in the county of Allegheny and State ofPennsylvania, have invented certain new and useful Improvements inMethods of Manufacturing Composite Metallic Articles, of which thefollowing is a specification.

This invention relates to a method of manufacturing composite metallicarticles, particularly copper coated iron and steel sheets or bars, orin other words a composite sheet or bar having an iron or steel centerand a copper coating, and has for its object to provide, in a manner asherein after set forth, a method of copper coating whereby the tensilestrength of the copper will be increased and the copper will bethoroughly welded with the iron or steel center.

It is a well known fact that when copper is brought to too high heat,say between 2300 to 2400 Fahr. that the life of the copper is takentherefrom and that the copper becomes dry andfull of blow holes, un-.

der such conditions becoming very unsatisfactory for any use. Toovercome this objection of high heating is one of the objects of themethod herein described, as the bath which contains copper, in which themetal is immersed forcoating, is maintained between a boiling heat and2200 Fahn, never rising above 2200 Fahr.

It is also a well known fact that when merchant iron is brought to adegree above a high welding heat that the iron becomes burnt and scalesto cinders, which makes the iron unfit for use. This same statement alsoapplies to steel; To overcome the foregoing objections, the iron andsteel, when ready for immersing in the bath in accordance with themethod as herein set forth, is

v the coating bath.

In carrying the method into'eifect a suitable quantity of commercialcopper is placedin a suitable receptacle and brought to a ISpecification of Letters Patent.

Patented Jan. 26, 1915.

Application filed November 28, 1913. Serial No. 803,439.

molten condition. by bringing the copper to tensile strength thereof.When the vanadium-aluminum alloy is placed into the molten copper, thealloy is at a temperature of 35 0O Fahr., the molten copper being about2100 Fahr.

The percentage relative to the proportions of the ingredients of thebath, by way of example, vanadium eight to twenty-five hundredths,aluminum six to twelve hundredths, A

the balance being copper.

It is well known that vanadium has a great afiinity for iron and steel,under such conditions it causes, when the iron or steel center is coatedwith the amalgam alloy, :1 high weld between the center and the copper.When the center is immersed in the vanadium aluminum copper bath, it isat a heat from l200 to 1500 Fahn, and remains in the bath from three tofive minutes.

It is well known that copper cannot be packed and rolled withoutsticking, but by coating in a manner as stated, the copper has thetensile strength thereof increased and the composite article can berolled without sticking at the required'heat and that the articles whenpacked will be prevented from sticking due to the vanadium hardening thecopper.

Briefly described the method consists in bringing a quantity ofcommercial copper in a suitable receptacle to a molten condition byheating the copper to a temperature about 2100 Fahr. Then combiningvanadium and aluminum toprovide a vanadium aluminum alloy. Thetemperature of the alloy being about 3500 Fahr. Then combining thevanadium and aluminum alloy at the temperature stated with the moltencopper, under such conditions providing a bath consisting of copper,aluminum and vanadium and maintaining the said bath at a temperature ofabout 2100 Fahr., then taking the article to be coated at a temperatureof 1500 Fahr., and immersing the article into the bath, the article toremain in the bath from three to five minutes, then removing the coatedarticle, and if desired immersing the same again for a period of oneminute. The coated article can then be treated in any desired manner.After the coated article has been removed from the bath it is at atemperature of 2200 Fahr. and it is rolled to thoroughly complete theweld.

What I claim is:

1. A method of coating iron and steel consisting in providing a moltenbath of cop per, aluminum and vanadium, and then immersing into saidbath the article to be coated.

2. A method of coating iron and steel which consists in immersing thearticle to be coated in a molten bath including copper and Vanadium.

3. A method of coating iron and steel consisting in providing a moltenbath of copper, aluminum and vanadium, maintaining said bath at atemperature of about 2100 Fahia, then immersing a metal article broughtto a temperature of about 1500 Fahn, in said bath, then removing thecoated article.

A method of coating iron and steel consi sting in providing a moltenbath of copper, aluminum and vanadium, maintaining said bath at atemperature of 2100 Fahn, then immersing into the bath the article to becoated, and then removing the coated article.

In testimony whereof I aflix my signa ture in the presence of twoWitnesses.

JOHN KIRBY. Witnesses:

MAX H. SROLOVITZ, N. L. BOGAN.

